you dont have to use 2x6's for 24" spacing on studs. you would if this was a house with a increased amount of weight load it would have to carry. also 2x6's are mainly used on outside walls or extreme load bearing walls supporting a girder truss. on all the sheds I have built, I used 2x4's on the walls and spaced them 24" apart on 8' or lower walls. If it is higher than 8' we space them 16" apart.
George has a pretty good idea on what he is doing. also to make it easier on you if you have access to a framing nailer or can borrow one it would really make the job faster and easier for you. if you use one shoot 16 penny nails in the studs and on plywood use 10 penny nails just incase if you didnt know.
the osb on the floors should be fine if you paint a few coats of ext water rest. paint. on the outside walls, the osb really should be covered up. over time it will soak up moisture and start to warp. vinyl siding is the cheapest thing to do so that should give you something to think about, I have never heard of painting osb for ext walls. I will ask my uncle, who is a contractor, about it tomorrow and see what would be the best, cheapest thing to do.
and dont run your floor joists on a 45 degree angle, it is almost impossible to get the floor square that way and also dont put triangles in the corners of the joists, once you lay the plywood down and get it square it wont budge. pm me if you have any questions
and one last thing, for paint use this, http://www.originalcolorchips.com/
you can get it at any paint store and it actually is a good bang for your buck, its really thick and durable.
George has a pretty good idea on what he is doing. also to make it easier on you if you have access to a framing nailer or can borrow one it would really make the job faster and easier for you. if you use one shoot 16 penny nails in the studs and on plywood use 10 penny nails just incase if you didnt know.
the osb on the floors should be fine if you paint a few coats of ext water rest. paint. on the outside walls, the osb really should be covered up. over time it will soak up moisture and start to warp. vinyl siding is the cheapest thing to do so that should give you something to think about, I have never heard of painting osb for ext walls. I will ask my uncle, who is a contractor, about it tomorrow and see what would be the best, cheapest thing to do.
and dont run your floor joists on a 45 degree angle, it is almost impossible to get the floor square that way and also dont put triangles in the corners of the joists, once you lay the plywood down and get it square it wont budge. pm me if you have any questions
and one last thing, for paint use this, http://www.originalcolorchips.com/
you can get it at any paint store and it actually is a good bang for your buck, its really thick and durable.

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